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Combination nCr in Python
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| import operator as op | |
| def ncr(n, x): | |
| x = min(n, n-x) | |
| if x == 0: return 1 | |
| num = reduce(op.mul, xrange(n, n-x, -1)) | |
| denom = reduce(op.mul, xrange(1, x+1)) | |
| return num // denom |
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